[shyams]

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This was the last board in my Robot challenge vs. cherdano

At this juncture, as per the GIB CC, South's options were:
--- 4♣ which shows 5+ clubs and is NOT forcing
--- 4♦ which shows 5+ clubs, 4+ spades, 17+ total points and is forcing
--- 4♥ which shows 5+ spades, 4+ hearts
--- Dbl which shows 1+ diamond, 4+ spades and 11+ total points. The text says nothing about whether GIB will treat it as forcing or not.
--- 4♠ (not sure) I think this showed a 6+ card solid spade suit.

My point is that there was no option available to South to show a 5-card spade suit without lying about the club suit.

I chose 4♦; cherdano chose Dbl. We both landed in game (me 5♣ on a 3-4 fit, he 4♥ on a 4-3 fit) when all along the best contract was 4♠. North held
♠ KT8
♥ QJ42
♦ KT9
♣ A43

Is this something that can be fixed?

[smerriman]

Gap In the Bidding sums it up pretty well.

[pilowsky]

Without interference, 2♠ would be a strong jump shift.
I just happened to have a hand on the teaching table where North opened 1♣ with 4♠ and I forced East to bid 1♦.
If I bid 2♠, South 'thinks' I have "free bid -- 6+♠; 13+ total points" and responded 3♠ "raise responder's response -- 3+ ♣; 2+♠; 11+ HCP; 12-15 total points.
North actually had:
SAQ85, HKQ82, no diamonds and CT8765.

Maybe you could call the Director?